Crush up the biscoff cookies till they're a fine texture. Add the butter until you've got enough that the cookies will stick together. Mush them into the bottom and up the sides of a pie dish to form to a crust. If you have time, put this in the fridge for half an hour.
Now simply add the cheesecake filling to the crust. In a microwave safe container, melt the cookie butter, and drizzle on top. If you want, you can take a knife and swirl it in the cheesecake filling. Cover and refrigerate until set.